Using Get-MgUserMailFolderChildFolder in Graph PowerShell

The Get-MgUserMailFolderChildFolder cmdlet is a part of the Microsoft Graph PowerShell module designed to retrieve child folders within a specified user's mail folder. This article covers the cmdlet's syntax, usage examples, tips, use cases, and possible errors with their solutions.

Syntax

Get-MgUserMailFolderChildFolder -UserId <String> -MailFolderId <String>  [-Property <String[]>] [-Filter <String>] []

• UserId: The unique identifier of the user. You can also specify the user's UserPrincipalName.
• MailFolderId: The unique identifier of the mail folder.
• Property: Specifies which properties to include in the response.
• Filter: Specifies an OData filter query to apply to the response.

Usage Examples

Example 1: Retrieve all child folders of a user's inbox

Get-MgUserMailFolderChildFolder -UserId "user@domain.com" -MailFolderId "inbox"

Example 2: Retrieve child folders and include specific properties

Get-MgUserMailFolderChildFolder -UserId "user@domain.com" -MailFolderId "inbox" -Property "displayName childFolderCount"

Example 3: Filter child folders by name

Get-MgUserMailFolderChildFolder -UserId "user@domain.com" -MailFolderId "inbox" -Filter "displayName eq 'Projects'"

Example 4: Retrieve child folders with the parent folder ID property included

Get-MgUserMailFolderChildFolder -UserId "user@domain.com" -MailFolderId "inbox" -Property "displayName parentFolderId"

Cmdlet Tips

• Use UserPrincipalName: When specifying the -UserId parameter, you can use the user's email address for convenience.
• Filter Results: Use the -Filter parameter to narrow down the results to specific folders.
• Select Properties: The -Property parameter allows you to fetch only the required properties, reducing the amount of data retrieved.

Use Cases

• Organizing User Mailboxes: Administrators can use this cmdlet to monitor and organize mail folders within user mailboxes.
• Auditing Mail Folders: Retrieve and audit specific child folders based on custom criteria, such as folder names or creation dates.
• Mailbox Management: Helps in managing mail folders by fetching their details and properties, aiding in automation scripts for mailbox management.

Possible Errors & Solutions

Error: ResourceNotFound

Cause: The specified mail folder does not exist.

Solution: Verify the -MailFolderId parameter value to ensure it is correct.

Error: InvalidUserId

Cause: The specified user ID is incorrect or the user does not exist.

Solution: Verify the -UserId parameter value. Ensure the user exists in the tenant and the value is correctly formatted.

Error: AccessDenied

Cause: Insufficient permissions to access the user's mail folders.

Solution: Ensure that the executing account has the necessary permissions to access the user's mail folders. This typically requires appropriate roles or delegated permissions. Mail.ReadWrite is the required Graph API permission.

Error: InvalidFilter

Cause: The OData filter query is malformed.

Solution: Check the syntax of the -Filter parameter. Ensure it follows the OData query standards.

Conclusion

The Get-MgUserMailFolderChildFolder cmdlet is a powerful tool for administrators to manage and retrieve child folders within user mailboxes in Microsoft 365. By understanding its syntax, parameters, and usage scenarios, you can efficiently organize and audit mail folders, ensuring better mailbox management. Always verify the parameters and ensure you have sufficient permissions to avoid common errors.

By leveraging the tips and handling possible errors as discussed, you can maximize the effectiveness of this cmdlet in your administrative tasks.

Additional Resources

Microsoft Graph PowerShell Module Documentation
Microsoft Graph API Documentation

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